
Outdoor Street lighting units used to illuminate a street or open areas via solar energy is termed as solar street light (SSL). Since their primary energy source is solar power, they operate in a stand-alone mode, therefore are not dependent on the general grid for any power requirements, whatsoever. Due to their dependency on sunlight, the lighting unit needs to be installed in a shadow-free area or a place where direct sunlight is available throughout the day to sufficiently charge the batteries for one working cycle. The standalone solar photovoltaic street lighting system comprises of a re-chargeable lead acid battery for storage, PV (photovoltaic) modules for charging the battery, light source (Compact Fluorescent Lamps (CFL) and Light Emitting Diodes (LED), suitable electronics for the operation of the tamp and safe charging and discharging of the battery and mechanical hardware for fixing these sub systems.